I just had to reinstall Windows 7 Ultimate, and have my exterior cable connection adjusted by Comcast. I've also upgraded my PCU from a Pentium D to a Core 2 Duo. Everything seems to be running just fine--EXCEPT when I try to watch live TV with Windows Media Center! Within five seconds, I now invariably get an error message that there's a "Device driver error," and that my "video playback device" does not support playback of "protected content"! What does this mean, and how can I correct it?

Something in your system doesn't support HDCP or whatever encryption they use.

As it turned out, the DRM for my system was messed up when I reinstalled Windows 7 Ultimate. After doing some online searching, I wound up going through a somewhat convoluted procedure to reset the DRM and update the PlayReady function of Windows Media Center. Once I did all of that, however, and reconfigured my TV signal, WMC settled right down, and is now working just fine!

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